เข้าใจความยาวของเว็กเตอร์สนิม

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เข้าใจความยาวของเว็กเตอร์สนิม

let a = vec![1, 2, 3];
assert_eq!(a.len(), 3);
1
0

สนิมว่างเปล่าเว็กเตอร์

let mut vec = Vec::new();

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